Simian_196

Ok thanks I will have to look into your suggestion Alun. Oh great some more research :-\ I will be back! for more help

Im from a small place, the Isle of Man. UK. look it up on google earth "Douglas" lat=54.15, lon=-4.48333 What do you think to my proposal?? Is it feasible for a newbie ;D I have a workshop at my disposal so I can make anything almost

;D I hope to purchase 5 of them, just need to get the funds released(the future wife controls the purse strings). Out of curiosity were is here? if you dont mind me asking?

Hi audioguru heres a link to the web site http://www.budgetbatteries.co.uk/category/14/Industrial-Tagged-Batteries.html?cartid=3223_20Nov05_211718 there close to the bottom of the page dark green in colour

Sorry, Doh' ::) The battery info:- voltage: 1.2 V type: Nickel Metal Hydride (NiMh) capacity: 3500 mAh function: Rechargeable Led info:- Attached file led.pdf

:) Alun, thanks for you help. It has opened up a whole new world for me, sad i know. I would like to here your thoughts about this, My project spec has altered slightly although I will still pursue it. (So in effect I have 2 projects on the go but this one is slightly more important) I am now going to attempt to build a torch for my bike using leds. :-\ I know you can buy bike lights cheaper fully assembled but where is the fun in that. I would like to add a few features standard lights don't have I think?? and build it myself.... keeps me out of trouble :) I would like to use the PWM circuit because of the dimming function, I intend to use this as part of the additional light functions. I have earmarked the circuit in the link below, if that is the correct way to go?? http://www.electronics-lab.com/forum/index.php?topic=2373.0 I would like to change the supply voltage from 12V to 6V. (Batteries are cheaper) I am going to use 19 leds for this torch, I have chosen 5000mcd white leds. I have also drawn up a preliminary layout for the led pcb see attached (not final) I will use SMT resistors for the leds to keep the physical size to a minimum (its approx the size of a 50pence piece) I will also sketch up the other boards when I get a chance I am going to add a battery monitor which gives me a visual indication using a circuit I found on the internet http://www.uoguelph.ca/~antoon/circ/batmon12.htm I will post pics of the board when I make it and all of the stages of the light manufacture, if any one is interested?? Should I move this thread to a new location??

Thanks for your help, for info the min and max voltage of the batteries is as follows:- min 11.8V max 13.4V The % i suggested would be between these voltages not between 0V and 12V. I didnt think it would be clear when i wrote the original request....sorry for any confusion. Si

:) Hi, I would like some help with a project that I would like to start. I have a torch which I would like to control using an electronic circuit. It would be preferable to have the circuit as an anologue set up, if this is not feasable then may a PIC set up would be more suitable?? Here goes! The brief I would like the lamp to do the following:- Turn on but does not blow the lamp (soft start) operate at different levels and have a level of battery protection Lamp function a - Soft start (protect the lamp against the initial start up of the circuit) b - Voltage monitor (10 LED bar?) this would give a visual indication of the battery level with a single push of a button (small switch on the circuit) c - Reed switch, with a single operation of the reed switch the lamp should do the following- full power - half power - quater power then off or if the reed switch is left on for more than 3 seconds an audible warning should sound until the reed switch contacts are opened again. Battery Protection All of the below should not be affected by trying to switch off the lamp and turn it on to try and get full power a - The lamp needs to be controlled so deep drain of the batteries does not occur i.e. when the battery level reaches 75% the lamp supply voltage is reduced to 75%, i would like an audible warning to occur over a period of 10 seconds every time this occurs probably pulse every 1 sec b - When the battery reaches approx 30% then the lamp supply voltage should be reduced to 25% and an audible warning as above. c - When the battery voltage reaches 10% above the min voltage the lamp should switch off, this should remain so until the battery voltage is at 100% Current components 1 - 12V 75W halogen lamp 2 - 12V 3.2Ah Lead acid battery (2off in parallel) 3 - Reed switch It seems quite difficult to a novice! but if there is any one that could help I would appreciate any comments even ideas I will add more details of the battery min and max operating voltages